Overfill limiting valve

Thanks Del. Have the 72 Dodge manuals but haven't run onto that. Guess I better look better. Have tried in past to sign in and access MyMopar and couldn't get it done. And some members think this new site is difficult.
Yote
Any suggestions for a limiting valve ? It would appear that without it raw fuel could be drawn into the vapor canister. Correct me if I'm wrong.